block guards...

But who here uses them? and and successful stories? Ive heard nothing but negative things like it creates hotspots up top on the cylinder...but I have a spare gsr block laying around so I wanna run a 85 or 100 shot of nitrous and the blockguard seems to be the cheapest way... also Im set on using nitrous not sure weather wet or dry or direct port yet but Im 100% sure im using nitrous on this build....any oppinions?

The positve of block guards is that they keep the sleeves from wandering. At the same time they create other problems. Like pissedoffsol said its better to run with out them. If you are doing a setup that would "need" a block guard its time to sleeve your block or reconsider your setup.

Direct port is a MUST with a shot that big, otherwise you face distribution problems. Tune it with the proper amount if timing retard and enough fuel and you can run as much as you want (within reason obvously), just dont detonate it or bye-bye sleeve or ring land.